Mater Dolorosa Passionist Retreat CenterLocated in the foothills of the San Gabriel Mountains, Mater Dolorosa is blessed with a spacious and comfortable retreat center that fosters and promotes spiritual growth and renewal through Passionist retreat programs, and by providing a peaceful environment of prayer and reflection.Dr. Michael Cunningham, O.F.S. 700 N Sunnyside Ave, Sierra Madre, CA 91024